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| Number | Title | Issue Date |
| 4803703 | Apparatus and method for fine synchronization of a communication receiver A system and method is described for synchronizing a paging receiver decoder to receive information in the form of digitally encoded signals. The digital signals include a synchronization signal followed by message data. The synchronization signal include... | 02/07/1989 |
| 4794392 | Vibrator alert device for a communication receiver An alerting device for a paging receiver for generating vibration motion in the paging receiver housing. The alerting means comprises an electric motor, an eccentric weight, and a linking means. The electric motor is activated in response to an alert sign... | 12/27/1988 |
| 4775083 | Portable radio carrying case A carrying case for a portable radio is provided which includes an attachment structure for attaching the case to the radio user. The carrying case includes a two position sound deflector which, at the option of the user, is situated in a first position t... | 10/04/1988 |
| 4772887 | Individual simulcast station control decoder A paging simulcast station remote control system decoder. The paging system decoder responds to signals generated in accordance with a predetermined signalling scheme comprising a series of tones and timed pauses. The decoder is also responsive to user pr... | 09/20/1988 |
| 4769610 | Tone decoder This tone decoder utilizes three correlators for detecting the presence of a desired tone signal. A main correlator correlates to the desired tone frequency, while two side correlators are used to correlate to frequencies above and below the desired tone ... | 09/06/1988 |
| 4766366 | Trimmable current source A trimmable current source for use with low voltage circuitry includes a plurality of trimming networks. A voltage-divider circuit is connected to the trimming networks. Each of the trimming networks includes a resistor in an isolated epitaxial region ser... | 08/23/1988 |
| 4761582 | Dual mode transducer An electroacoustic transducer such as a piezoelectric element transducer includes an output mode for generating an alert signal and an input mode for generating a switching signal. The transducer comprises an actuating means, such as a pushbutton, a resil... | 08/02/1988 |
| 4758833 | Paging universal remote control decoder A paging station remote control system decoder is described. The paging system decoder is responsive to signals generated in accordance to a signalling scheme comprising a series of tones and timed pauses generated by a paging system encoder. The paging s... | 07/19/1988 |
| 4754423 | Electronic selector and method for selecting desired functions and levels This is a selector circuit for an electronic device such as a pager that has a plurality of functions with each of the functions having a plurality of levels. First and second switches are provided for selecting the functions and levels. A controller such... | 06/28/1988 |
| 4751481 | Molded resonator The molded resonator includes at least one formed resonator element having an resonator portion and opposed end leg portions which provide electrical connections to the main portion. A dielectric portion is molded about the resonator element. A conductive... | 06/14/1988 |
| 4749991 | Turn off protection circuit In system capable of self turn-off, a circuit arrangement for providing a controlled turn-off includes a detecting circuit for detecting actuation of a turn-off switch, thereby providing a turn-off authorization signal. A turn-off protection circuit is co... | 06/07/1988 |
| 4741074 | Detachable belt clip suitable for automated assembly For proper pre-assembly alignment of the hinge plate holes (e.g., 120b and 136b), stops (e.g., 140a) are engaged in notches (e.g., 119b). A hinge pin (128) is then inserted into the aligned holes to attach the clip (130) to the base plate (102). The pin i... | 05/03/1988 |
| 4737969 | Spectrally efficient digital modulation method and apparatus A method and apparatus are provided for generating a uniquely shaped prototype digital pulse which is transmitted with minimal frequency spectrum consumption and yet a relatively high bit rate. Such uniquely shaped digital pulse is stored in a memory incl... | 04/12/1988 |
| 4737797 | Microstrip balun-antenna apparatus An balun-antenna arrangement is provided which is capable of being fabricated on a printed circuit board by automated equipment. The balun-antenna includes a microstrip transmission line which is coupled to one end of a split microstrip transmission line ... | 04/12/1988 |
| 4725395 | Antenna and method of manufacturing an antenna This antenna includes a helically formed wire coil having a lower end that is positioned in a connector a solid dielectric material is injection molded into the coil and connector to precisely maintain the coil dimensions and support the coil. An outer co... | 02/16/1988 |
| 4721955 | Paging universal remote control system A paging station remote control system capable of providing analog or binary modulation modes is described. Control of the paging base station is effected through a signalling scheme comprising a combination of tones and timed pauses generated in response... | 01/26/1988 |
| 4721923 | Radio receiver speech amplifier circuit A speech amplifier circuit increases the maximum perceived loudness at the speaker (412) and reduces distortion at high volume levels without increasing the power consumed by the speech powder amplifier (410). When a low volume is selected by the volume c... | 01/26/1988 |
| 4719322 | Radio housing and expandable chassis with integral keypad and acoustic speaker seal An expandable chassis includes a four sided frame with a central opening to receive a plate or "shield" which is allowed to move within the frame between two predetermined positions. Protuberances on the shield contact the frame and limit its inward movem... | 01/12/1988 |
| 4718109 | Automatic synchronization system An improved synchronization system for use with simulcast transmission systems is described. The invention provides a method and means for keeping the information signals for adjacent transmitters in the system in synchronization. This invention utilizes ... | 01/05/1988 |
| 4717989 | Heat sink, EMI shield and controller module assembly for a portable radio transceiver A controller module includes a cast module base having a central recess with a peripheral ledge. A cover plate is positioned in the recess and supported by the ledge. A flexible circuit is attached to the inside surface of the cover plate and includes two... | 01/05/1988 |
| 4716331 | Electrically variable piezoelectric hybrid capacitor An electrically variable three terminal monomorphic piezoelectric capacitor is manufactured with thick or thin film hybrid microelectronic circuit technology. A first capacitor plate and a ridge, which substantially surrounds and extends above the first c... | 12/29/1987 |
| 4716501 | Indicator light assembly with fluorescent lens A clear plastic lens contains a fluorescent dye. The lens is substantially parallelepiped in shape with two major opposed parallel surfaces and four sides. Three of the sides are reflecting sides. Each reflecting side has two flat transparent surfaces pos... | 12/29/1987 |
| 4714439 | Electrical connector An electrical connector is provided for making electrical connection to a mating connector. The connector includes a body portion that has a substantially cylindrical cavity. A contact block is located in the cavity and carries three contacts. A spring en... | 12/22/1987 |
| 4713622 | Multiple state tone generator A tone generator for producing a plurality of output tone waveforms for a plurality of frequencies, includes an encoder for selectively generating a first waveform that has a first number of states and second waveform that has a second number of states wh... | 12/15/1987 |
| 4713599 | Programmable trimmable circuit having voltage limiting A trimmable circuit includes a first transistor for generating an output current and a plurality of programmable trimming networks connected to the first transistor for regulating the output current of the first transistor. The plurality of programmable t... | 12/15/1987 |
| 4713631 | Varactor tuning circuit having plural selectable bias voltages A variable capacitance circuit includes a varactor having an anode side and a cathode side. A first variable bias voltage is applied to one of the sides and one of a plurality of voltages is applied as a second bias voltage to the other side for controlli... | 12/15/1987 |
| 4704740 | Display pager with separate readout module A liquid crystal display module with self contained display decoder circuitry is attached to a radio frame with a minimum of electrical interconnections. Module assembly and attachment are both accomplished without the use of tools. Attaching the module t... | 11/03/1987 |
| 4704573 | Impedance mismatch detector A mismatch detector is provided for determining whether or not a particular load impedance is matched or mismatched to the characteristic impedance of a transmission line. The detector is capable of determining if a particular load impedance has a value o... | 11/03/1987 |
| 4701934 | Method of doppler searching in a digital GPS receiver An improved method of doppler searching in a digital GPS receiver is described. According to the principles of the present invention, an N-point fourier transform is performed on samples of a down converted GPS signal representing the entire range of Dopp... | 10/20/1987 |
| 4701724 | Injection switch and directional coupler An R.F. switch includes a directional coupler with a main line and a quarter wavelength coupled arm. One end of the main line is connected to a first input port and the other end is connected to a first output port. The coupled arm is selectibly terminate... | 10/20/1987 |
| 4701758 | Individual simulcast transmitter remote control system encoder A paging simulcast station remote control system encoder is described. The paging system encoder generates signals in accordance with a predetermined signalling scheme comprising a series of tones and timed pauses and generated in response to control sign... | 10/20/1987 |
| 4701759 | Call reminder for a radio paging device An alerting device, such as a radio pager, which produces an audible alerting signal, in response to a unique identifier received and decoded by said device, incorporates circuitry for periodically reminding the user that a lagging signal has been receive... | 10/20/1987 |
| 4698790 | Programmable read only memory adaptive row driver circuit An I2 L programmable read only memory (PROM) row driver circuit sinks current from a row of memory elements when selectively activated. The circuit operates in the read mode at very low power levels and down to 1.0 volt. The circuit has two cur... | 10/06/1987 |
| 4690471 | RF interconnect with triaxial self-alignment An RF interconnect between a printed circuit board and a coaxial connector mounted in a housing is self-aligning along all three major axes. The coaxial connector has a pin connected to its inner conductor that extends beyond the edge of the outer conduct... | 09/01/1987 |
| 4686528 | Method of encoding and decoding data signals In a multiple state data signal, a first and second state are equated to logic states while a third state is designated as a read state. The read state and one of the two logic states are alternately generated so that each logic state is immediately prece... | 08/11/1987 |
| 4682165 | Apparatus for inhibiting repetitive message detections in a zone batched communication system A logic circuit is provided in a multifunction selective call receiver operating in a time sequential zone batched message communication system to prevent repeated alerts of the same message. A single lockout timer is reset by the first detection of a mes... | 07/21/1987 |
| 4680527 | Electrical battery including apparatus for current sensing An electrical battery is provided which includes a current sensing resistor situated in series with a plurality of battery cells located within a housing. The respective ends of the plurality of cells are coupled to positive and negative contacts on an ex... | 07/14/1987 |
| 4680676 | Portable radio housing with logic and RF shielding A portable radio housing has a shield that provides electromagnetic isolation between logic and radio boards operating on close frequencies. The radio board is positioned in a conductive frame having fours sides surrounding a central opening. A tab on the... | 07/14/1987 |
| 4679233 | Microphone This microphone includes a microphone element, speaker and antenna all internal to the microphone housing. These components are carried by a chassis that is fastened to the microphone body at its lower end which also provides the effective attachment poin... | 07/07/1987 |
| 4677528 | Flexible printed circuit board having integrated circuit die or the like affixed thereto A flexible printed circuit board assembly having an integrated circuit die bonded directly thereto. A first layer of the flexible printed circuit board assembly includes a plurality of conductive paths and geometrical patterns on each of its surfaces. The... | 06/30/1987 |
